linux-kernel - Re: [PATCH v2 01/26] genirq: add irq

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Message-ID: <53FCC714.3090206@codeaurora.org>
Date:	Tue, 26 Aug 2014 10:42:44 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux@...ts.openrisc.net,
	linux@....linux.org.uk, shawn.guo@...escale.com,
	kernel@...gutronix.de, tony@...mide.com, catalin.marinas@....com,
	will.deacon@....com, jonas@...thpole.se, tglx@...utronix.de,
	jason@...edaemon.net, shc_work@...l.ru, baohua@...nel.org,
	maxime.ripard@...e-electrons.com, khilman@...aro.org,
	lorenzo.pieralisi@....com, larry.bassel@...aro.org,
	mark.rutland@....com, sudeep.holla@....com,
	stefan.kristiansson@...nalahti.fi, vkale@....com,
	schwidefsky@...ibm.com, Vladimir Murzin <vladimir.murzin@....com>
Subject: Re: [PATCH v2 01/26] genirq: add irq_domain-aware core IRQ handler

On 08/26/14 03:03, Marc Zyngier wrote:
> Calling irq_find_mapping from outside a irq_{enter,exit} section is
> unsafe and produces ugly messages if CONFIG_PROVE_RCU is enabled:
> If coming from the idle state, the rcu_read_lock call in irq_find_mapping
> will generate an unpleasant warning:
>
> <quote>
> ===============================
> [ INFO: suspicious RCU usage. ]
> 3.16.0-rc1+ #135 Not tainted
> -------------------------------
> include/linux/rcupdate.h:871 rcu_read_lock() used illegally while idle!
>
> other info that might help us debug this:
>
> RCU used illegally from idle CPU!
> rcu_scheduler_active = 1, debug_locks = 0
> RCU used illegally from extended quiescent state!
> 1 lock held by swapper/0/0:
>  #0:  (rcu_read_lock){......}, at: [<ffffffc00010206c>]
> irq_find_mapping+0x4c/0x198

Do you have the whole stacktrace? I don't see where this is called
outside of irq_enter() from within the idle loop, but maybe I missed
something.

-- 
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